New York Times, Green Inc. – Gavin Schmidt, a NASA climatologist, has in many ways become the news media’s conscience on climate science, exposing exaggeration and opinion in climate coverage on the blog he founded, RealClimate.org. In a recently published book, “Climate Change: Picturing the Science,” Mr. Schmidt and his co-author, the photographer Joshua Wolfe, attempt to tell the story of global warming with the same no-nonsense approach — albeit this time with photographs.